Strong nonuniformity in the helical divertor flux distribution is seen both in numerical calculations and in experiments. Flux profiles along the divertor trace on the vacuum vessel change according to vacuum magnetic configurations. Diverted particles choose one of two X-points as the escaping channel to divertor legs, which is determined by the local magnetic shear just inside the X-point. Ergodicity inside both X-points is also estimated quantitatively by a measure of Kolmogorov length for each magnetic configuration. The relationship between ergodicity and the choice of X-point for diverted particles is also discussed.
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Morisaki et al. (2002) studied this question.
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